Why was Hoss named Hoss?

I suppose because Eric Cartwright was as 'big as a horse' ; RIP Mr. Dan Blocker .

In the Bonanza episode "Journey Remembered", Ben Cartwright's second wife, Inger, gave birth to Eric "Hoss" Cartwright. His older brother wanted to name him Hoss, Inger wanted to name him Eric after his grandfather. Inger stated among mountain people Haus or Hoss meant big friendly man. Ben told Adam, "We'll give him both names and see which one sticks.

Inger died in an Indian attack shortly after Hoss was born.